Hardware ID

The hardware ID library provides a simple interface to retrieve a unique hardware ID. You can retrieve the hardware ID by calling the hw_id_get() function.

The Hardware ID sample uses this library.

Configuration

To enable the library, set the CONFIG_HW_ID_LIBRARY Kconfig option to y in the project configuration file prj.conf.

You can configure one of the following Kconfig options to choose the hardware ID:

• CONFIG_HW_ID_LIBRARY_SOURCE_IMEI - This option specifies the International Mobile (Station) Equipment Identity (IMEI) of the modem.

• CONFIG_HW_ID_LIBRARY_SOURCE_UUID - This option specifies the UUID of the modem.

• CONFIG_HW_ID_LIBRARY_SOURCE_BLE_MAC - This option specifies the default Bluetooth® Low Energy MAC address.

• CONFIG_HW_ID_LIBRARY_SOURCE_NET_MAC - This option specifies the MAC address of the default network interface.

• CONFIG_HW_ID_LIBRARY_SOURCE_DEVICE_ID - This option specifies a serial number provided by Zephyr’s HW Info API.

API documentation

Header file: include/hw_id.h

Source files: lib/hw_id/

group hw_id

Library that provides a unified interface for fetching a unique device ID from hardware.

Functions

int hw_id_get(char *buf, size_t buf_len)

Fetch unique device ID.

Note

The buffer should be at least HW_ID_LEN bytes long.

Parameters

• buf – [out] destination buffer

• buf_len – [in] length of destination buffer

Returns

0 If the operation was successful.

Returns

-EINVAL If the passed in pointer is NULL or buffer is too small.

Returns

-EIO If requesting platform ID failed.